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https://issues.apache.org/jira/browse/HDFS-16838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tao Li resolved HDFS-16838.
---------------------------
    Fix Version/s: 3.3.9
       Resolution: Fixed

> Fix NPE in testAddRplicaProcessorForAddingReplicaInMap
> ------------------------------------------------------
>
>                 Key: HDFS-16838
>                 URL: https://issues.apache.org/jira/browse/HDFS-16838
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: ZanderXu
>            Assignee: ZanderXu
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.3.9
>
>
> There is a NPE in 
> org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.TestFsVolumeList#testAddRplicaProcessorForAddingReplicaInMap
>  if we run this UT individually. And the related bug as bellow:
>  
> {code:java}
> public void testAddRplicaProcessorForAddingReplicaInMap() throws Exception {
>   // BUG here
>   BlockPoolSlice.reInitializeAddReplicaThreadPool();
>   Configuration cnf = new Configuration();
>   int poolSize = 5; 
>   ...
> }{code}
>  
> _addReplicaThreadPool_ may not have been initialized and is null, if we run 
> testAddRplicaProcessorForAddingReplicaInMap unit test as an individual unit 
> test.
> {code:java}
> @VisibleForTesting
> public static void reInitializeAddReplicaThreadPool() {
>   addReplicaThreadPool.shutdown();
>   addReplicaThreadPool = null;
> }{code}



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